Issue 19 solved

Revert the last Haptic changes (was unfinished, no more spare time during the week-end, sorry!)
Revert my last modification on main views (offset not displayed in Bar Graphs, I was wrong)
PPM Center now configurable for each servo
No mean on the Batt voltage when in the calibration menu to have a faster response when calibrating
SD card Backup / Restore Models feature started
Some french translations fixed

util/compile.py

@@ -16,7 +16,7 @@ options_stock = [[("", "EXT=STD"), ("frsky", "EXT=FRSKY"), ("jeti", "EXT=JETI"),
 options_v4 = [[("", "EXT=FRSKY")],
               [("", "HELI=NO"), ("heli", "HELI=YES")],
               [("", "TEMPLATES=NO"), ("templates", "TEMPLATES=YES")],
-              [("", "LOGS=NO"), ("logs", "LOGS=YES")],
+              [("", "SDCARD=NO"), ("sdcard", "SDCARD=YES")],
               [("", "SOMO=NO"), ("SOMO", "SOMO=YES")],
              ]